59 	int err = 0;  in msr_read()  local
66 		err = rdmsr_safe_on_cpu(cpu, reg, &data[0], &data[1]);  in msr_read()
67 		if (err)  in msr_read()
70 			err = -EFAULT;  in msr_read()
77 	return bytes ? bytes : err;  in msr_read()
115 	int err = 0;  in msr_write()  local
118 	err = security_locked_down(LOCKDOWN_MSR);  in msr_write()
119 	if (err)  in msr_write()
120 		return err;  in msr_write()
122 	err = filter_write(reg);  in msr_write()
123 	if (err)  in msr_write()
124 		return err;  in msr_write()
131 			err = -EFAULT;  in msr_write()
137 		err = wrmsr_safe_on_cpu(cpu, reg, data[0], data[1]);  in msr_write()
138 		if (err)  in msr_write()
145 	return bytes ? bytes : err;  in msr_write()
153 	int err;  in msr_ioctl()  local
158 			err = -EBADF;  in msr_ioctl()
162 			err = -EFAULT;  in msr_ioctl()
165 		err = rdmsr_safe_regs_on_cpu(cpu, regs);  in msr_ioctl()
166 		if (err)  in msr_ioctl()
169 			err = -EFAULT;  in msr_ioctl()
174 			err = -EBADF;  in msr_ioctl()
178 			err = -EFAULT;  in msr_ioctl()
181 		err = security_locked_down(LOCKDOWN_MSR);  in msr_ioctl()
182 		if (err)  in msr_ioctl()
185 		err = filter_write(regs[1]);  in msr_ioctl()
186 		if (err)  in msr_ioctl()
187 			return err;  in msr_ioctl()
191 		err = wrmsr_safe_regs_on_cpu(cpu, regs);  in msr_ioctl()
192 		if (err)  in msr_ioctl()
195 			err = -EFAULT;  in msr_ioctl()
199 		err = -ENOTTY;  in msr_ioctl()
203 	return err;  in msr_ioctl()
264 	int err;  in msr_init()  local
270 	err = class_register(&msr_class);  in msr_init()
271 	if (err)  in msr_init()
274 	err  = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "x86/msr:online",  in msr_init()
276 	if (err < 0)  in msr_init()
278 	cpuhp_msr_state = err;  in msr_init()
285 	return err;  in msr_init()